Volume-variable lithium battery thermal runaway test chamber internal filling device

Abstract

The utility model discloses a volume-variable lithium battery thermal runaway test chamber, which comprises side filling devices and / or bottom filling devices, at least one side filling device and / or at least one bottom filling device are / is detachably arranged in an inner cavity of the test chamber in a partitioned manner, and the side filling devices and / or the bottom filling devices are / is detachably arranged in the inner cavity of the test chamber. A sample mounting area and an inherent mounting area of sensors around the cabin body are avoided; each side face filling device and each bottom filling device are respectively calibrated with a fixed volume; each side face filling device and each bottom filling device each comprise an outer shell, an inner reinforcing rib plate and filler. Wherein the inner reinforcing rib plates are sequentially arranged in the length direction of the outer shell so as to divide the outer shell into a plurality of filling spaces, and each filling space is filled with filler. According to the utility model, the volume of the test cabin can be adjusted according to the size of a battery sample, so that the test precision of the battery sample is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery safety, and particularly relates to an internal filling device of a lithium battery thermal runaway test chamber with variable volume. Background Art

[0002] In the booming development of the new energy vehicle industry, the frequent occurrence of safety accidents has sounded the alarm. Among them, battery thermal runaway has become the primary culprit of accidents, prompting consumers' focus to shift from the "range anxiety" of battery life to the more fundamental "safety anxiety". This transformation highlights the core obstacle of the safety of power batteries in promoting the healthy and sustainable development of the industry. In view of this, the research on the mechanism of lithium battery thermal runaway has become a hot topic that the academic and industrial circles are competing to overcome.

[0003] Currently, the test device for evaluating the risk of lithium battery thermal runaway, namely the thermal runaway test chamber, generally adopts a fixed volume design. This well-known technical standard aims to simulate the reaction of the battery under extreme conditions. However, with the increasing diversification of the lithium battery market, the differences in battery models in terms of shape, size, and energy storage capacity have increased significantly, posing a severe challenge to the versatility and adaptability of the test chamber. The selection of the test chamber volume should essentially be based on the consideration of the gas volume released instantaneously during battery thermal runaway. However, the current fixed volume design obviously cannot fully adapt to the characteristics of various batteries.

[0004] Specifically, although increasing the test chamber volume theoretically improves the inclusiveness of large-size battery samples, obvious limitations have been exposed in practice. When applied to the thermal runaway experiment of small batteries, due to the relatively small gas production, the gas dilution in the huge chamber is serious, resulting in a significant decrease in the sensitivity and accuracy of sampling and measurement, and thus seriously affecting the reliability and effectiveness of the test results. This contradiction not only limits the scientific value of the test data but also hinders the in-depth and accurate understanding of the safety performance of lithium batteries, becoming a major bottleneck restricting the progress of new energy vehicle safety technology. Summary of the Invention

[0005] The utility model aims to at least partly solve one of the technical problems in the above-mentioned technologies.

[0006] To achieve the above object, a variable-volume internal filling device for a lithium battery thermal runaway test chamber according to a first aspect of the present utility model includes: a side filling device and / or a bottom filling device, wherein at least one of the side filling devices and / or at least one of the bottom filling devices are partitioned and detachably arranged in the inner cavity of the test chamber to avoid the sample installation area and the inherent installation area of the sensors around the chamber body; each of the side filling devices and each of the bottom filling devices are respectively calibrated with a fixed volume; each of the side filling devices and each of the bottom filling devices includes an outer shell, internal reinforcing rib plates, and a filler; wherein, a plurality of the internal reinforcing rib plates are sequentially arranged along the length direction of the outer shell to divide the outer shell into a plurality of filling spaces, and each of the filling spaces is filled with the filler.

[0007] In addition, the variable-volume internal filling device for a lithium battery thermal runaway test chamber according to the above-mentioned present utility model may further have the following additional technical features:

[0008] As a further description of the above technical solution: the shapes of the side filling device and the bottom filling device include, but are not limited to, rectangular, arc-shaped, or cylindrical.

[0009] As a further description of the above technical solution: the installation states of the side filling device and the bottom filling device include single-piece independent use or multi-piece stacking use.

[0010] As a further description of the above technical solution: the installation positions of the partitioned arrangement include, but are not limited to, the bottom, side, and top of the battery sample.

[0011] As a further description of the above technical solution: handles for easy pulling are provided on both the side filling device and the bottom filling device.

[0012] As a further description of the above technical solution: limiting chutes are provided on the inner wall of the test chamber, and limiting sliders matching the limiting chutes are provided on the side filling device and the bottom filling device, so that the side filling device and the bottom filling device can only move along the depth of the inner cavity.

[0013] As a further description of the above technical solution: connecting latches are respectively provided on the side filling device and the bottom filling device to connect the stacked side filling devices or bottom filling devices when used in a multi-piece stacking manner.

[0014] The variable-volume internal filling device for a lithium battery thermal runaway test chamber according to the present utility model has the following beneficial effects:

[0015] (1) Significantly improve test accuracy: The utility model can accurately adjust the space in the cabin through the filling of the side filling device and the bottom filling device, especially for the thermal runaway test of small-capacity batteries, to ensure that even under the condition of limited gas production, the sample gas collection and measurement still maintain a high degree of accuracy. It effectively solves the problem of low accuracy of traditional fixed-volume cabins when testing small-size batteries, and greatly enhances the reliability and effectiveness of experimental data.

[0016] (2) High flexibility and compatibility: The side filling device and the bottom filling device not only have various shapes, but also support single-piece independent use or multiple-piece free stacking use. Each piece has a known fixed volume, which is convenient for operators to flexibly combine and customize the test environment according to the specific battery size and test requirements, thereby improving the versatility and adaptability of the test chamber and meeting the testing needs of the battery market.

[0017] (3) Enhanced safety protection and durability: By filling the outer shell with fillers, the overall strength is improved, allowing the device to maintain a stable shape and avoid deformation under extreme pressure changes (such as the moment of thermal runaway of the battery), thereby protecting the integrity and safety of the test chamber. In addition, this design reduces the direct effect of harmful substances on the cabin wall, significantly extending the service life of the test chamber and reducing long-term maintenance costs.

[0018] (4) Convenient maintenance and efficient management: The specially configured handle design makes the filling device easy to install and disassemble quickly, which not only simplifies the preparation and cleaning process before and after the test, but also facilitates regular inspection and replacement of filling materials, greatly reducing the downtime of equipment maintenance and improving the test efficiency and turnover rate of laboratory resources.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0021] Figure 1 It is a schematic diagram of the installation structure of a filling device inside a variable-volume lithium battery thermal runaway test chamber according to one embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the shape structure of a side filling device and a bottom filling device according to an embodiment of the utility model;

[0023] Figure 3 This is a schematic structural diagram of a side filling device according to an embodiment of the utility model;

[0024] As shown in the figure:

[0025] 100, Side filling device; 101, Handle; 110, Outer shell; 120, Internal reinforcing rib plate; 130, Filling material; 200, Bottom filling device; 300, Test chamber; 301, Inner cavity; 400, Sample mounting plate; 500, Battery sample. Specific embodiments

[0026] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0027] The variable-volume lithium battery thermal runaway test chamber according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0028] As Figures 1 to 3 shown, the internal filling device of the variable-volume lithium battery thermal runaway test chamber according to the embodiments of the present invention may include a side filling device 100 and / or a bottom filling device 200.

[0029] Among them, at least one side filling device 100 and / or at least one bottom filling device 200 are partitioned and detachably arranged in the inner cavity 301 of the test chamber 300 to avoid the sample installation area and the inherent installation areas of the sensors around the chamber body.

[0030] It should be noted that in the prior art, the battery thermal runaway test chamber 300 is mostly of a horizontal cylindrical structure, and the center position of the cylinder is the test sample installation area. That is, through the erected sample mounting plate 400, the battery sample 500 is set on the sample mounting plate 400 for testing. When installing the side filling device 100 and the bottom filling device 200, this area should be avoided to prevent affecting the normal test of the battery.

[0031] In addition, various sensors are arranged around the chamber body, such as temperature sensors, pressure sensors, gas analysis sensors, humidity sensors, current sensors, etc.

[0032] Therefore, the installation of the side filling device 100 and the bottom filling device 200 needs to not affect the effective operation of the above various sensors, ensuring that they can accurately collect data at key parts during the test without being interfered by the filling material, so as to improve the accuracy and repeatability of the test, while maintaining the flexibility and versatility of the layout of the test chamber 300.

[0033] In addition, the installation positions arranged in zones include, but are not limited to, the bottom, side, and top of the battery sample 500, and the appropriate installation position can be selected according to the geometric shape of the battery sample 500.

[0034] Each side filling device 100 and each bottom filling device 200 are respectively calibrated with a fixed volume, which is convenient for the operator to make combined arrangements according to the test requirements.

[0035] Each side filling device 100 and each bottom filling device 200 both include a housing 110, internal reinforcing rib plates 120, and a filler 130.

[0036] Among them, a plurality of internal reinforcing rib plates 120 are sequentially arranged along the length direction of the housing 110 to divide the housing 110 into a plurality of filling spaces, and each filling space is filled with a filler 130.

[0037] It should be noted that the housing 110 is made of stainless steel metal and is fully welded to ensure the overall airtightness. The internal filler 130 is made of rigid polyurethane material, which not only ensures the structural strength but also has the characteristics of light weight, and can ensure that the whole device does not deform under the sudden increase in pressure during the thermal runaway of the battery.

[0038] Specifically, when relevant staff test the battery sample 500, first, the relevant staff analyze the size of the battery sample 500 to be tested, and select the corresponding number of bottom filling devices 200 and / or side filling devices 100 in combination with the volume of the test chamber.

[0039] Then, the relevant staff install the bottom filling device 200 and / or the side filling device 100 according to the installation strategy they set, and ensure the tight fit between the bottom filling device 200 and / or the side filling device 100 and the test chamber 300 to form a test space adapted to the battery sample 500.

[0040] Then, the relevant staff close the hatch and perform a thermal runaway simulation experiment, effectively managing the gas distribution by using the bottom filling device 200 and / or the side filling device 100 to improve the accuracy of the test data.

[0041] After the experiment is completed, the relevant staff remove the bottom filling device 200 and / or the side filling device 100, conduct necessary inspections and maintenance, and prepare for subsequent tests.

[0042] In an embodiment of the present utility model, the shapes of the side filling device 100 and the bottom filling device 200 include, but are not limited to, rectangular, arc-shaped, or cylindrical, which can adapt to the geometric characteristics of different battery samples 500 to ensure the sealing and accuracy during the filling process.

[0043] In an embodiment of the present utility model, the installation states of the side filling device 100 and the bottom filling device 200 both include single-piece independent use or multi-piece stacked use, meeting the requirements of different scenarios from small-scale to large-scale tests, and enhancing the versatility and economy of the equipment.

[0044] To clearly illustrate the previous embodiment, in an embodiment of the present utility model, connection latches are respectively provided on the side filling device 100 and the bottom filling device 200 to connect the stacked side filling devices 100 or bottom filling devices 200 when used in a multi-piece stacked manner.

[0045] It should be noted that through the connection latch design, the stability and firmness during the stacking of multiple devices are ensured. Even for complex multi-layer structures, good consistency can be maintained, improving the stability of the overall system.

[0046] In addition, handles 101 for easy pulling are provided on both the side filling device 100 and the bottom filling device 200, facilitating quick pulling and precise placement by the user, and enhancing the convenience and efficiency of experimental operations.

[0047] In an embodiment of the present utility model, limiting sliding grooves are opened on the inner wall of the test chamber 300, and limiting sliding blocks matching the limiting sliding grooves are provided on the side filling device 100 and the bottom filling device 200, enabling the side filling device 100 and the bottom filling device 200 to move only along the depth of the inner cavity 301, avoiding unexpected movement and improving the repeatability and reliability of the test.

[0048] It should be noted that when relevant staff members are installing, they can select the corresponding limiting sliding grooves for the limiting sliding blocks and push them in, causing the side filling device 100 or the bottom filling device 200 to move along the limiting sliding grooves. After the movement is completed, it can be locked by a locking member or pressed and limited by closing the cabin door.

[0049] In summary, according to the variable volume internal filling device of the lithium battery thermal runaway test chamber of the embodiment of the utility model, through the filling of the side filling device 100 and the bottom filling device 200, especially for the thermal runaway test of small-capacity batteries, the space in the chamber can be accurately adjusted to ensure that even under the condition of limited gas production, the sample gas collection and measurement still maintain a high degree of accuracy, effectively solving the problem of low accuracy of the traditional fixed volume chamber when testing small-sized batteries, and greatly enhancing the reliability and validity of the experimental data; the side filling device 100 and the bottom filling device 200 not only have various shapes, but also support single-piece independent or multiple-piece free stacking use, each with a known fixed volume, which is convenient for operators to flexibly combine and customize the test environment according to the specific battery size and test requirements, thereby providing The versatility and adaptability of the test chamber 300 are improved, meeting the testing needs of the battery market; by filling the filler 130 in the outer shell 110, the overall strength is improved, so that the device can maintain a stable shape and avoid deformation under extreme pressure changes (such as the moment of thermal runaway of the battery), thereby protecting the integrity and safety of the test chamber 300. In addition, this design reduces the direct effect of harmful substances on the cabin wall, significantly extends the service life of the test chamber 300, and reduces long-term maintenance costs; the specially configured handle 101 design makes the filling device easy and quick to install and disassemble, which not only simplifies the preparation and cleaning process before and after the test, but also facilitates the regular inspection and replacement of the filling material, greatly reducing the downtime of equipment maintenance, and improving the test efficiency and the turnover rate of laboratory resources.

[0050] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0052] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A variable volume lithium battery thermal runaway test chamber internal filling device, characterized in that: include: A side filling device (100) and / or a bottom filling device (200), wherein at least one of the side filling devices (100) and / or at least one of the bottom filling devices (200) is arranged in partitions and detachably disposed in an inner cavity (301) of a test chamber (300) to avoid a sample installation area and an inherent installation area of ​​sensors around the chamber; each of the side filling devices (100) and each of the bottom filling devices (200) is respectively calibrated with a fixed volume; each of the side filling devices (100) and each of the bottom filling devices (200) comprises an outer shell (110), an internal reinforcing rib plate (120) and a filler (130); wherein a plurality of the internal reinforcing rib plates (120) are sequentially disposed along the length direction of the outer shell (110) to divide the outer shell (110) into a plurality of filling spaces, each of the filling spaces being filled with the filler (130).

2. The internal filling device of the variable volume lithium battery thermal runaway test chamber according to claim 1, characterized in that: The shapes of the side filling device (100) and the bottom filling device (200) include but are not limited to a rectangular shape, an arc shape, or a cylindrical shape.

3. The internal filling device of the variable volume lithium battery thermal runaway test chamber according to claim 1, characterized in that: The installation states of the side filling device (100) and the bottom filling device (200) include independent use of a single piece or stacking use of multiple pieces.

4. The internal filling device of the variable volume lithium battery thermal runaway test chamber according to claim 1, characterized in that: The installation positions of the partition arrangement include but are not limited to the bottom, side and top of the battery sample (500).

5. The internal filling device of the variable volume lithium battery thermal runaway test chamber according to claim 1, characterized in that: The side filling device (100) and the bottom filling device (200) are both provided with a handle (101) for easy pulling out.

6. The internal filling device of the variable volume lithium battery thermal runaway test chamber according to claim 1, characterized in that: A limit slide groove is provided on the inner wall of the test chamber (300), and limit sliding blocks matching the limit slide groove are provided on the side filling device (100) and the bottom filling device (200), so that the side filling device (100) and the bottom filling device (200) can only move along the depth of the inner cavity (301).

7. The internal filling device of the variable volume lithium battery thermal runaway test chamber according to claim 3, characterized in that: The side filling device (100) and the bottom filling device (200) are respectively provided with connecting lock buckles, so as to connect the stacked side filling devices (100) or the bottom filling devices (200) when the multiple pieces are stacked for use.

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